Electronic entity having a magnetic antenna

Abstract

An electronic entity includes an electronic circuit ( 21 ) having at least one first terminal ( 22 ) and a second terminal ( 24 ) to which an antenna is connected. The antenna includes a conducting element ( 26 ) electrically connected to the first terminal ( 22 ) of the electronic circuit ( 21 ) and includes a resonator ( 28 ) insulated from the conducting element ( 26 ) at the antenna, electrically connected to the second terminal ( 24 ) of the electronic circuit ( 21 ) and coupled to the conducting element ( 26 ).

1. An electronic entity comprising:
 an electronic circuit having at least a first terminal and a second terminal to which a magnetic antenna is connected, 
 wherein the antenna comprises a conductive member ( 6 ;  16 ;  26 ;  36 ) electrically connected to the first terminal of the electronic circuit and a resonator ( 8 ;  18 ;  28 ;  38 ) having a Q enabling amplification at the communication frequency of the electronic circuit, isolated from the conductive member ( 6 ;  16 ;  26 ;  36 ) at the level of the antenna, electrically connected to the second terminal of the electronic circuit, and coupled to the conductive member ( 6 ;  16 ;  26 ;  36 ). 
 
     
     
       2. The electronic entity according to  claim 1 , wherein the resonator ( 8 ;  18 ;  28 ;  38 ) is capacitively coupled to the conductive member ( 6 ;  16 ;  26 ;  36 ). 
     
     
       3. The electronic entity according to  claim 2 , wherein the capacitance of the conductive member is negligible compared to the coupling capacitance (C c ). 
     
     
       4. The electronic entity according to  claim 2 , wherein the resonator ( 8 ;  18 ;  28 ) comprises a turn facing the conductive member ( 6 ;  16 ;  26 ) over at least a portion of its perimeter. 
     
     
       5. The electronic entity according to  claim 4 , wherein the turn faces the conductive member ( 6 ;  16 ;  26 ) over virtually all of its perimeter. 
     
     
       6. The electronic entity according to  claim 4 , wherein the turn and the conductive member ( 6 ;  16 ;  26 ) are situated at a distance less than 0.5 mm over said perimeter portion. 
     
     
       7. The electronic entity according to  claim 1 , wherein the conductive member is formed by a turn portion. 
     
     
       8. The electronic entity according to  claim 1 , wherein the capacitance of the conductive member is negligible compared to the capacitance (C R ) of the resonator. 
     
     
       9. The electronic entity according to  claim 1 , wherein the inductance of the conductive member is negligible compared to the inductance (L R ) of the resonator. 
     
     
       10. The electronic entity according to  claim 1 , wherein the resonator ( 8 ;  18 ;  28 ;  38 ) takes the form of a conductive winding having at least one free end. 
     
     
       11. The electronic entity according to  claim 10 , wherein the resonator ( 28 ;  38 ) is connected to the second terminal by the end of the winding opposite the free end. 
     
     
       12. The electronic entity according to  claim 10 , wherein said conductive winding comprises a plurality of turns. 
     
     
       13. The electronic entity according to  claim 12 , wherein the turns are separated two by two by a distance less than 0.5 mm. 
     
     
       14. The electronic entity according to  claim 10 , wherein the conductive member is inside the area defined by the resonator. 
     
     
       15. The electronic entity according to  claim 1 , wherein the conductive member ( 6 ;  16 ;  26 ;  36 ) and the resonator ( 8 ;  18 ;  28 ;  38 ) are deposited on a common plane support. 
     
     
       16. The electronic entity according to  claim 1 , wherein the resonant frequency of the resonator alone is not more than 10% greater than a communication frequency of the electronic circuit. 
     
     
       17. The electronic entity according to  claim 1 , wherein the electronic circuit operates at a communication frequency below 100 MHz. 
     
     
       18. The electronic entity according to  claim 17 , wherein said communication frequency is from 1 MHz to 50 MHz. 
     
     
       19. The electronic entity according to  claim 18 , wherein the communication frequency is from 13 MHz to 15 MHz. 
     
     
       20. The electronic entity according to  claim 19 , wherein the resonant frequency of the resonator alone is from 13.6 MHz to 17 MHz. 
     
     
       21. The electronic entity according to  claim 1 , having overall exterior dimensions less than 100 mm. 
     
     
       22. The electronic entity according to  claim 21 , wherein the resonator ( 8 ;  18 ) comprises more than ten turns. 
     
     
       23. The electronic entity according to  claim 21 , wherein said exterior dimensions are less than 30 mm. 
     
     
       24. A pocket electronic entity according to  claim 1 . 
     
     
       25. The electronic entity according to  claim 1 , forming a microcircuit card. 
     
     
       26. The electronic entity according to  claim 25 , wherein the antenna extends over about half the area of the card. 
     
     
       27. The electronic entity according to  claim 1 , wherein the end of the conductive member ( 6 ;  26 ;  36 ) opposite the first terminal of the electronic circuit is free. 
     
     
       28. The electronic entity according to  claim 1 , constituting an electronic identity document. 
     
     
       29. An electronic entity comprising:
 an electronic circuit having at least a first terminal and a second terminal to which an antenna is connected, 
 wherein the antenna comprises a conductive member ( 6 ;  16 ;  26 ;  36 ) electrically connected to the first terminal of the electronic circuit and a resonator ( 8 ;  18 ;  28 ;  38 ) having a Q enabling amplification at the communication frequency of the electronic circuit, isolated from the conductive member ( 6 ;  16 ;  26 ;  36 ) at the level of the antenna, electrically connected to the second terminal of the electronic circuit, and coupled to the conductive member ( 6 ;  16 ;  26 ;  36 ), and the resonator ( 8 ;  18 ;  28 ;  38 ) takes the form of a conductive winding having two free ends. 
 
     
     
       30. The electronic entity according to  claim 29 , wherein said conductive winding comprises a plurality of turns. 
     
     
       31. The electronic entity according to  claim 30 , wherein the turns are separated two by two by a distance less than 0.5 mm. 
     
     
       32. The electronic entity according to  claim 29 , wherein the conductive member is inside the area defined by the resonator. 
     
     
       33. An electronic entity comprising:
 an electronic circuit having at least a first terminal and a second terminal to which an antenna is connected, 
 wherein the antenna comprises a conductive member ( 6 ;  16 ;  26 ;  36 ) electrically connected to the first terminal of the electronic circuit and a resonator ( 8 ;  18 ;  28 ;  38 ) having a Q enabling amplification at the communication frequency of the electronic circuit, isolated from the conductive member ( 6 ;  16 ;  26 ;  36 ) at the level of the antenna, electrically connected to the second terminal of the electronic circuit, and coupled to the conductive member ( 6 ;  16 ;  26 ;  36 ), and the resonator ( 8 ;  18 ;  28 ;  38 ) is inside the conductive member ( 6 ;  16 ;  26 ;  36 ). 
 
     
     
       34. An electronic entity comprising:
 an electronic circuit having at least a first terminal and a second terminal to which an antenna is connected, 
 wherein the antenna comprises a conductive member ( 6 ;  16 ;  26 ;  36 ) electrically connected to the first terminal of the electronic circuit and a resonator ( 8 ;  18 ;  28 ;  38 ) having a Q enabling amplification at the communication frequency of the electronic circuit, isolated from the conductive member ( 6 ;  16 ;  26 ;  36 ) at the level of the antenna, electrically connected to the second terminal of the electronic circuit, and coupled to the conductive member ( 6 ;  16 ;  26 ;  36 ), and 
 the projection of the circuit formed by the antenna and the electronic circuit in a plane that is substantially parallel to that projection forms a line with no intersections and wherein the antenna comprises a winding ( 8 ;  18 ;  28 ;  38 ) that extends over strictly more than one turn. 
 
     
     
       35. An electronic entity comprising:
 an electronic circuit having at least a first terminal and a second terminal to which an antenna is connected, 
 wherein the antenna comprises a conductive member ( 6 ;  16 ;  26 ;  36 ) electrically connected to the first terminal of the electronic circuit and a resonator ( 8 ;  18 ;  28 ;  38 ) having a Q enabling amplification at the communication frequency of the electronic circuit, isolated from the conductive member ( 6 ;  16 ;  26 ;  36 ) at the level of the antenna, electrically connected to the second terminal of the electronic circuit, and coupled to the conductive member ( 6 ;  16 ;  26 ;  36 ), and 
 the conductive member is produced in a first plane, the resonator is produced in a second plane different from the first plane, and the resonator is in line with the conductive member. 
 
     
     
       36. The electronic entity according to  claim 35 , wherein a median turn of the resonator is in line with the conductive member. 
     
     
       37. An electronic entity comprising:
 an electronic circuit having at least a first terminal and a second terminal to which an antenna is connected, 
 wherein the antenna comprises a conductive member ( 6 ;  16 ;  26 ;  36 ) electrically connected to the first terminal of the electronic circuit and a resonator ( 8 ;  18 ;  28 ;  38 ) having a Q enabling amplification at the communication frequency of the electronic circuit, isolated from the conductive member ( 6 ;  16 ;  26 ;  36 ) at the level of the antenna, electrically connected to the second terminal of the electronic circuit, and coupled to the conductive member ( 6 ;  16 ;  26 ;  36 ), and the conductive member ( 16 ) forms a loop connected at both ends to the first terminal of the electronic circuit.